Doolittle: yes please. Metal Machine Music: no thanks. The current vogue for "heritage" acts delivering their best albums live, in their entirety, is a double-edged sword, says Martin Aston. NEXT WEEK, THE WHO (or Who's Left anyway) perform Quadrophenia at London's Royal Albert Hall for the Teenage Cancer Trust charity, while Primal Scream revisit Screamadelica at Olympia in November. At this rate, it's quite possible that every single famous act will have showcased their undisputed "classic" album by the end of 2010. Should we be worried? When I read the headline "Lou Reed Brings Controversial Metal Machine Music To Life"...